help with proper framing of roof-wall-celing

Forgive my terms if they are wrong, I've attached pictures to try and explain it better.

The previous owner of my house enclosed an outdoor patio. This room has always been drafty and cold. On windy days papers will actually blow off the desk.

The ceiling is vaulted and the roof overhangs with soffits. A few years back I had a company put vinyl siding on, they basically just went right over top of what was there. This included large, missing boards in the soffits.

I decided to take the vinyl soffits off and have a look underneath. When I looked up through where the soffit boards were missing, I realized I could see right in to the ceiling of this room. The ceiling has fiberglass batts.

I'm guessing this is not right. I'll fix the soffits with proper OSB boards, but should it be sealed at the top of the wall plate so the ceiling is not just completely open to the soffits. I understand it needs some airflow, especially with fiberglass batts, but the present configuration seems extreme.

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#1 Please go back and add you location to your profile.
Just go to quick links to edit.
There was suppose to baffles added before the insulation was added for air flow.
The rafters should have been added on to fit the needed amount of insulation without compressing it.
A real picture of the addition would be a help.
Google "Smart vent" there often used in situations like this.

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Sorry to have to keep asking questions but can you post a picture of this addition on the outside, from one of the ends?
Is this a single story house?
Just trying to figure out why it was built that way.

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You say that on windy days, papers get blown off the desk. Where is that airflow coming from? Not likely thought the sheetrock on the inside...
The roofline looks fine/soffits look fine, though, wait for Joe's take.